From: =?UTF-8?q?Florian=20B=C3=A4uerle?= <florian.baeuerle@allegion.com>
Date: Thu, 25 Oct 2018 17:26:30 +0200
Subject: [PATCH] allow overriding modification time

This patch allows to set the mtime of the lzop archive to 
$SOURCE_DATE_EPOCH, required for reproducible build. It was submitted to 
pengutronix by florian Bäuerle in october 2018.

https://git.pengutronix.de/cgit/ptxdist/tree/patches/lzop-1.04/0002-allow-overriding-modification-time.patch

Signed-off-by: Casey Reeves <casey@xogium.me>
---
 src/lzop.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/lzop.c b/src/lzop.c
index a540ad9c4d33..c2f877d16f92 100644
--- a/src/lzop.c
+++ b/src/lzop.c
@@ -712,6 +712,7 @@ void init_compress_header(header_t *h, const file_t *fip, const file_t *fop)
     assert(opt_method > 0);
     assert(opt_level > 0);
     assert(fip->st.st_mode == 0 || S_ISREG(fip->st.st_mode));
+    const char *source_date_epoch = getenv("SOURCE_DATE_EPOCH");
 
     memset(h,0,sizeof(header_t));
 
@@ -748,7 +749,13 @@ void init_compress_header(header_t *h, const file_t *fip, const file_t *fop)
 
     h->mode = fix_mode_for_header(fip->st.st_mode);
 
-    if (fip->st.st_mtime > 0)
+    if (source_date_epoch)
+    {
+        time_t mtime = strtoul(source_date_epoch, NULL, 0);
+        h->mtime_low  = (lzo_uint32) (mtime);
+        h->mtime_high = (lzo_uint32) ((mtime >> 16) >> 16);
+    }
+    else if (fip->st.st_mtime > 0)
     {
         h->mtime_low  = (lzo_uint32) (fip->st.st_mtime);
         h->mtime_high = (lzo_uint32) ((fip->st.st_mtime >> 16) >> 16);
